function s1_hello(){
     echo "hello, world!"
} 
function s2_tell_who_i_am(){
  whoami
}
function s3_which_distro_do_i_use(){
cat /etc/os-release |head -n 1|grep "NAME"
}
function s4_view_my_cpu_arch(){
uname -m
}
function s5_show_first_scsi_disl_size(){
lsblk -l | \grep disk | \grep '^nvme0n1' | awk '{print $4}'
}
function s6_show_main_memory_size_in_megabytes(){
free -m |grep "Mem:" |awk '{print $2}'
}
